Remove redundant mathinline.h.

Remove redundant mathinline.h.

commit 7df49c5d81b9f8ea55f16af939e0662d24cc099e
Author: Ulrich Drepper <drepper@redhat.com>
Date:   Sun Aug 17 07:34:10 2008 +0000

2008-08-14  Ryan S. Arnold  <rsa@us.ibm.com>

	[BZ #6845]
	* sysdeps/powerpc/fpu/bits/mathinline.h (__signbitl): Copy new
	__signbitl definition and __LONG_DOUBLE_128__ guard from:
	* sysdeps/unix/sysv/linux/powerpc/bits/mathinline.h: Remove as
	redundant.  Functions which call floating point assembler operations
	should go into a sysdeps powerpc/fpu directory.